Put these glasses on your face and that's where they stay, period. Give credit to the co-injected Hydrolite that line the glasses from temple to temple, the flexible hinges making them fit, and side vents that keep the lenses clear. That way, you can see your trophy come over the stern and not just feel it in every muscle. Features: Lens Size: 60mm • Hinge: Integral • Design Patent: D595,333S • Frame Material: Nylon • Extra Large Fit.